/*
 * Copyright (c) 2008-2011, Matthias Mann
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Matthias Mann nor the names of its contributors may
 *       be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.gxf.gui.model;

/**
 * A simple list selection model
 *
 * @param <T> the data type of the list model
 * @author Matthias Mann
 */
public class SimpleListSelectionModel<T> extends HasCallback implements ListSelectionModel<T> {

    private final ListModel<T> listModel;
    private int selected;

    public SimpleListSelectionModel(ListModel<T> listModel) {
        if(listModel == null) {
            throw new NullPointerException("listModel");
        }
        this.listModel = listModel;
    }

    public ListModel<T> getListModel() {
        return listModel;
    }

    public T getSelectedEntry() {
        if(selected >= 0 && selected < listModel.getNumEntries()) {
            return listModel.getEntry(selected);
        } else {
            return null;
        }
    }

    public boolean setSelectedEntry(T entry) {
        return setSelectedEntry(entry, NO_SELECTION);
    }

    public boolean setSelectedEntry(T entry, int defaultIndex) {
        if(entry != null) {
            for(int i=0,n=listModel.getNumEntries() ; i<n ; i++) {
                if(entry.equals(listModel.getEntry(i))) {
                    setValue(i);
                    return true;
                }
            }
        }
        setValue(defaultIndex);
        return false;
    }

    public int getMaxValue() {
        return listModel.getNumEntries()-1;
    }

    public int getMinValue() {
        return NO_SELECTION;
    }

    public int getValue() {
        return selected;
    }

    public void setValue(int value) {
        if(value < NO_SELECTION) {
            throw new IllegalArgumentException("value");
        }
        if(this.selected != value) {
            this.selected = value;
            doCallback();
        }
    }
}
